Lec05 - 2. Discovering the Universe for Yourself Mark Twain...

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Unformatted text preview: 2. Discovering the Universe for Yourself Mark Twain (1835 1910) American author, from Huckleberry Finn We had the sky, up there, all speckled with stars, and we used to lay on our backs and look up at them, and discuss about whether they was made, or only just happened. My ranking of topic relevance... 1. The Reason for Seasons year - earth orbit around sun (winter vs. summer); when to reap/sow 2. The Circling Sky day - rotation of earth (day vs. night); when to get up/go to bed... 3. The Moon, Our Constant Companion month - phases of the moon, tides; when to pay your bills... 4. Patterns in the Sky constellations; navigation; how to get where you want to go... 5. The Ancient Mystery of the Planets retrograde motion; geocentric vs. heliocentric universe... 6. Precession of Earths Axis why your zodiac sign is wrong... The Circling Sky Local Directions on Sky North vs. South; East vs. West coordindates: altitude & azimuth Celestial Sphere Fixed coordinates declination and right ascension analogous to latitude & longitude on earth Measuring the Sky We measure the sky in angles , not distances....
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Lec05 - 2. Discovering the Universe for Yourself Mark Twain...

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